API Reference > geometry-core > Curve > ConstructCurveBetweenCurves > interpolateBetween interpolateBetween MethodStatic Construct a geometry item which is fractionally interpolated between two others. The construction is only supported between certain types: LineSegment3d+LineSegment3d -- endpoints are interpolated LineString3d+LineString3d with matching counts. Each point is interpolated. Arc3d+Arc3d -- center, vector0, vector90, and limit angles of the sweep are interpolated. interpolateBetween(geometry0: GeometryQuery, fraction: number, geometry1: GeometryQuery): GeometryQuery | undefined Parameter Type Description geometry0 GeometryQuery geometry "at fraction 0" fraction number fractional position geometry1 GeometryQuery geometry "at fraction 1" Returns - GeometryQuery | undefined Defined in core/geometry/src/curve/ConstructCurveBetweenCurves.ts Line 124 Last Updated: 13 June, 2024